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<br />RIO GRANDE COMPACfCOMMISSION REPORT
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<br />Rio Grande near Lobatos, Colo.
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<br />Location.-Water.stage ",corder, lat 37'1)4'42", long 105"45'22", in sec. 22, T. 33 N., RII E, un right bank at highway bridge, 6 miles
<br />north of Colorado-New Mexico State line, 10 tniles east of Lobatoo, and 14 miles east of Antonito. Datum of g.ge is 7,427.63 h above
<br />mean sea lli'vel, datum of 1929.
<br />Drainaee area.-7,7OO sq mi, approximately (includes 2,940 sq mi in closed basin in San Luis Vailey).
<br />Averaee discharge._31 years (1900.30), 846 h3/s (612,900 aC"'.h per year); 64 yea" (/931-94) 447 h3/s (323,900 acre-h per year).
<br />EX''''Jl1es.-1899_1994: Maximum discharge observed, 13,200 h'!s Iune 8, 1905 (gage height, 9.1 h), from rating CUrve extended above
<br />8,000 ft3/s; no flow at times in 1950-51. 1956.
<br />Remarks.-Records good except those for Winter months, which a", fair. Natural flow of st",amaffeeted bytransmountain diversions,
<br />storage reservoirs, ground-water withdrawals and diversions for irrigation, and "'tum flow from irrigated a"'as.
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<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Second_ Maximum Minimum RUnoff in
<br />Month foot-da dail daily Mean acre-feet
<br />January 9,360 350 270 3()2 18,570
<br />February 9,830 440 310 351 19,500
<br />March 15,176 661 291 490 30,100
<br />April 14,543 1,200 286 485 28,850
<br />May 36,244 1,970 325 1,169 71,890
<br />June 31,898 2,220 325 l,llS3 63,270
<br />Iuly 3,070 294 41 99.0 6,090
<br />August 1,157 58 24 37.3 2,290
<br />September 1,747 131 32 58.2 3,470
<br />October 2,962 144 31 95.5 5,880
<br />Novemb~r 6,087 4()() 109 203 12,070
<br />December 12,419 522 358 401 24,630
<br />Calendar year 1994 144,493 2,220 24 396 286,600
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<br />Willow Creek above Heron Reservoir, near Los Ojos, N. Mex.
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<br />~.-Water-stage recorder, lat 36"44'33", long IllS"37'34", in Tiena Amariila Grant, on right bank 200 ft downst"'am from bridge,
<br />0.2 mile downst",am from Iron SPring Creek, 3.3 miles West of Loo Ojos, and at mile 9.7. Datum of 8"ge is 7,196.29 ft above mean
<br />sea level. Prior to Apr. t 1971, at site 900 ft downstream.
<br />Drainae-e area.-J12 sq mi.
<br />A Veraee discha'1;e._7 years 0963-69), 11.5 fl3/ S (8,330 acre-fl per Y"ar) prior to completion of Azotea tunnel; 25 years 0970-94), 138 fl3/s
<br />n 00,000 acre-ft per year) subsequent to completion of Azotea tunnel. .
<br />&x'''''nes.-1962_94: MaXimum diSCharge, 1,610 h3/s Mar. 12, 1985 (gage height, 6.65 h); no flow a. times Prior to 1971.
<br />~.-Records good except those for winter months, which are fair. Subsequent to Nov. 16, 1970, flow affected by transmOUntain
<br />diversions through Azotea tunnel. Flow in Rutheron Drain included prior to Apr. I, 1971.
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<br /> Monthly and yearly discharge, In cubic feet per second
<br /> Second- Maximum Minimum Runoff in
<br />Month foot-days daily daily Mean acre-feet
<br />January 7.94 O,SO 0.00 0.26 16
<br />February 14.00 .50 .50 .SO 28
<br />March 4,930.50 559 .50 159 9,780
<br />April 12,128 933 58 404 24,060
<br />May 23,025 1,020 194 743 45,670
<br />June 6,004.0 88] 6.0 200 lJ,91O
<br />July 421.02 53 .38 13.6 835
<br />August 30.43 3.2 .18 .98 60
<br />September 20.00 2.5 .]5 .67 40
<br />October 21.51 22 .14 .69 43
<br />November 7].86 22 .18 2.40 143
<br />December 49.93 20 .13 1.61 99
<br />Calendar year 1994 46,724.19 1,020 .00 128 92,680
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